Friction shock-absorbing mechanism



2 Sheets- Sheet 1 W. A. GEIGER FRICTION SHOCK ABSORBING MECHANISM FiladJuly 9, 1923 Aug. 24, 1926.

Aug. 24,1926. 1,597,444

W. A. GElGER FR-ICTION snocx ABSORBING MECHANISM 'Fi lecl July 9, 1923 uZShets-Sheei 2 Win/Z55 65 Z'nuenfar Patented Aug. 24, 1925;

UNITED STATES AT NT- OFFICE; j-

WILLIAM .AIGEIGER, on oII oAeo, ILLINoIs, nssionon,nrmnsnnAssIeNMnNrs,To

, w. H.,MI1\TER, Inc, A oonnonn'rron on nnnawnnn.

' FRICTION snooxnnsonnrns MECHANISM.

Application filed. .Tuly I 9,

shell, and atthe' same time so arranged that the friction surfacesinsure balanced;pressureon all'sides.

A'more-specific object of the'invention is to proviso a friction shellof triangular cross-section-which; may be accommodated in the usualdraft gear space andbetween the arms of yokes usedm commerclal'practice.

' Inthe drawings forming a part brass specification, Figure l isahorizontal; longitudinal, sectional view of a portion of a railway draftrigging, showing my imr provements in connection therewith,the sec tionthroughthe shock absorbing mechanism proper, however, correspondingtotwo "intersecting planes at 120 to each other. Fig; 2 is a front endelevation of the shock absorbing mechanism proper. Fig. 3 is a vertical,transverse, sectional view of the shock absorbing mechanism proper,correspondingto the line 33 of Fig. 1; Fig.4 is an end elevational viewof the-wedge employed with myconstruction. And Fig. 5 is-adetailedperspective of one-of the fricti'on shoes. r l i In saiddrawings, 10-10 denote theusual draft sillsof acar underframe,to=theinner face's of which are secured front stop lugs 11 andrear stop lugs12. A portionof the i draw bar, is indicated at 18, to which isoperatively connected a hooded' castflyoke' 'Tithin the yoke 14; aredisposed the shock absorbing mechanism proper, hereinafterdescribedg afront followerf-1-5 andfa rear follower 16: The yoke and partstherewithin are supported in operative po'sition by a detachable saddle"plate 17. To maintain the combined friction shell and spring cage,"hereinafter described, in cen- "tral 1:03am, I preferablyemployf guidelar shape.

1922. Serial No. 650,339.

plates 18'18 secured to the inner faces of the draft sills, said guideplates .beingfurther illustrated in Fig. 3 toshow themafi} nor in whichthe shell ismaintained in contral-position. i

Theimproved shock absorbing mechanism proper,- as shown, comprisesa-combined friction shell and springca'ge casting Ag a spring resistanceB pressure transmitting wedge 'G two shoes D-D; a third shoe E1; aspringfollower F andaretainerboltG.

tiou ,as-best shownin Fig; 3, the same haw ing a botto1nwall19 and twoupwardly converging walls, 20920. saidwalls-19* and g The combinedfrictionnshell and spring cage castmgA, 1's ofgtrlangular, cross-sec- 20areprefer'ably symmetrically arranged with respect to the axis of themechanism so as to leave aninterior of equilateral triangucasting, theinner faces of the walls of the shell are forme-d'to provideloi'i'gitudinally extending flat friction surfaces 21 21, said surfaces21' being converged inwardly of the shellf- The remainder ofthe castingpro At the front or outer end of the ides a cage for thespringresistance B,

and; preferably, thecasting has an integral rear wall 22- which bearsagainst the rear followerlti." "At each end, the-casting A isstrengthened by suitable fflan'ges 23-23 whicl'r somewhatv change theappearance of the section of the casting as viewedin end elevatio'n'but,as heretofore stated, the'main part of the casting 1s of triangular formthroughout. By'making, one of the walls of j i i the casting horizontaland disposing it at the bottom, I am enabled; to accommodate the sl1ellwithintl1e arm of a yoke of usual dimensions and also the shell is'readily ac- 1 com modated between two sills spacedi -tli'e usualdistance apart. Furthermore,l providea flat bottom for the shelladapting; it I to rest upon the lowe'r-a-r m of the yoke, and

the upper part of the shell, has, in-efiect, a

flat" surface" to 'co-operatewith the upper' arm of the yoke, this efictbeing obtained by employing longitudinally {extending reiinforo'ing"ribs; -'a'sjbestishowii in Fig.

ure 3.

7 Three friction shoes and'E areem ployed, cachet which: is preferablyin the form ofa heavy thiCk plate 25 -w-ith an in the projection26 aretapered away as'india sides thereof with faces 29 that are inclinedwardly extended projection 26, as shown in Figs. 1 and 5, and having anouter flat friction face 121 co-operating with the correspondingfriction face 21 of the cylinder. Each of the projections 26is so formedas to provide a flat shoulder 27 facing toward the inner end of theshell, and the sides of cated at 28-28 in order to accommodate saidprojections within the shell. when. the shoes are assembled as shown inFigs. 2 and 3. In the case of the two shoes DD, the lugs 26 are providedon the front or outer rearwardly and toward the axis of the mechanism,at a relatively blunt angle. In

the case of the shoe E, a Wedgeface 30v is provided on the front orouter side of the projection 26, said wedge face 30 extending at arelatively acute or keen angle with respect to the axis of themechanism; The inner ends of all threeshoes normallyengage the laterallyextended flanged cupshaped spring follower. F.. Said-;iiange 31 ispreferably of hexagonal contour as in- ,dicated best in Fig; 3 so as tobe readily accommodated within. the triangular frictionshelland at thesame time provide the .necessarybearing for the outer heavy coil of thespring resistance B, it being understood that the inner lighter coil isaccommodated within the cup section 32 of thefol- 1 lower F.

The wedge C is preferably in the form ofa cored casting-having an outerfiat face v33 bearing against the front follower l5,'and

' :accommodate' the shank of the bolt,said bolt servingto retain theparts in assembled po- ,sition and also to maintain the spring underinitial compression.

In operation, assuming an action underbufllthe wedge Gis forced towardthe right,

as viewed in Fig. 1. A wedgingaction is thus set up with said wedge andall-three shoeswhichis greatly augmented as the shoes and wedge travelinwardly of the, tapered fri'ction'shel'l, D uje to .-the,;lreen angleem- 'ployed on the engaging faces of the shoe- E andtthe wedge C, I am.enabled to obtain very. high capacity without danger of the partssticking, the blunt angle wedge faces .29 and 129; acting-as ffs'afetyvalves to prevventthe partsnfrom sticking orjamming.

I make no specific claim to the specific arrangenient of blunt and lreenanglewedge I faces between the Wedge and shoes inasmuch as this 7 formsthe; subject matter of other pending applications assigned to the sameassignee.

By employing a friction shell having three friction surfaces arranged intriangular form and-three friction shoes, it will be observed that Iam'assured of equalized or balanced pressure between all three shoes andthe friction surfaces of the shell, even though there 'may be someirregularities in the location of the various'wedge faces of the wedgeand shoes; Stated in another manner,

by-employing a triangular formation, I obtam the main advantages of acylindrical shell, three c-shoe andsingle wedgearrange- -ment, oneof themain characteristics of which is to balance pressure between the shoesand shells lVith; thetrian ular shell Iain enabled to employ fiatfriction sur- J faces which more readily accommodate themselves to afinishing operation and' at less expense than .in the case of curvedfriction surfaces; Also, for a friction shell employing flat frictionsurfaces on the interior thereof, I use the minimum amount of metal for;aflgiven friction area and over all dimensions.

I have herein shown and described the preferred manner of carrying outthe invention, but the same is merely illustrative and "all changes andmodificationsarecontemplated that come withln claims appended hereto.

I claim: I 1."In-a friction shockabsorbing mechanism, the combinationwith a friction'shell the scope of the having a plurality'oflongitudinally d'is-' posed interior, flat friction surfaces, each ofsaid surfaces being transversely inclined .witlrrespect to all of:the'remaining surfaces; of a spring resistance; friction shoescorresponding in number tothe friction surfaces-of the shell andeachhaving a flat friction surface cooperable with oneof said shellsurfaces; and wedgemeans 'co-operar ble with said shoes.

2. As. an article; of manufacture, a friotion shell having threeinterior flat friction surfaces extending longitudinally, each of saidsurfaces being transversely inclined -with respect to the remainingsurfaces of the *shell.

I 3. As'a'n' article of manufacture, a friction shell having threemutually adjacent interior I flat" friction surfaces extendinglongitudinally,-said friction surfacesjbci'ng disposed l in triangularformation, providing a set of surfaces; two adjacent surfaces of whichdiverge transversely ofthe shell toward the remaining surface thereof,said friction. surflaices being also converged inwardly'of the s ellw a4. In a r' iilwayidraftrigging, the combination witlrfdraft sills havingstop acting means 'andayoke; of africtionshock ab- .r-solrh ing.mechanism mounted within the arms of said yoke and between the draftsills, said mechanism including a friction shell of triangularcross-section with one Wall thereof extending horizontally and disposedat the bottom, the Walls of said shell providing three interior flatfriction surfaces, each of said surfaces being transversely inclinedwith respect to all of the remaining surfaces and defining a triangularinterior for the shell.

In Witness that I claim the foregoing I day of July 1923.

Y WI L LIAM A. GEIGER.

